Title (en)

A PROCESS FOR IMPROVING A WATER ABSORBENT POLYACRYLIC ACID POLYMER AND AN IMPROVED POLYMER PRODUCED BY SAID PROCESS

Publication

EP 0248437 A3 19900912 (EN)

Application

EP 87108131 A 19870604

Priority

• JP 4083487 A 19870224
• JP 13056086 A 19860604

Abstract (en)

[origin: EP0248437A2] A process for improving a water absorbent polyacrylic acid polymer in which the polymer is contacted with an aqueous solution containing a water soluble peroxide radical initiator, followed by heating, thereby causing substantially only the surface portion of the polymer to undergo crosslinking with the radical initiator while leaving the remaining core portion of the polymer substantially intact. The improved water absorbent polyacrylic acid polymer is excellent in both water absorbency and water absorption rate, and the hydrogel resulting from absorption of water has a pleasant, non-sticky feel. The improved water absorbent polyacrylic acid polymer can be advantageously utilized to produce a desirable disposable diaper, sanitary napkin, surgical pad, surgical sheet, paper towel or the like.

IPC 1-7

C08K 5/14; C08J 3/24

IPC 8 full level

C08J 3/24 (2006.01)

CPC (source: EP US)

C08J 3/245 (2013.01 - EP US); C08J 2333/02 (2013.01 - EP US)

Citation (search report)

• [XP] EP 0208945 A1 19870121 - HAYASHIKANE SHIPBUILDING & ENG [JP]
• [AD] EP 0036463 A2 19810930 - SEITETSU KAGAKU CO LTD [JP]

Designated contracting state (EPC)

BE CH DE FR GB IT LI NL

DOCDB simple family (publication)

EP 0248437 A2 19871209; EP 0248437 A3 19900912; US 4783510 A 19881108

DOCDB simple family (application)

EP 87108131 A 19870604; US 5719387 A 19870603